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Philips Semiconductors
1GHz low voltage LNA and mixer
DESCRIPTION
The SA631 is a combined low-noise BiCMOS amplifier, and mixer
designed for high-performance low-power communication systems
from 800-1000MHz. The low-noise preamplifier has a 1.7dB noise
figure at 881MHz with 15dB gain and an IP3 intercept of –7dBm at
the input. The gain is stabilized by on-chip compensation to vary
less than 0.2dB over –40 to +85 C temperature range. The
wide-dynamic-range mixer has a 10dB noise figure and IP3 of
+3.3dBm at the input at 881MHz. The nominal current drawn from a
single 3V supply is 8.3mA. Additionally, the entire circuit can be
powered down to further reduce the supply current to less than
20µA.
FEATURES
Low current consumption
Outstanding gain and noise figure
Excellent gain stability versus temperature and supply voltage
LNA and mixer power down capability
Designed in Philips state of the art BiCMOS QUBIC process
APPLICATIONS
900MHz cellular and cordless front-end
Spread spectrum receivers
RF data links
UHF frequency conversion
Portable radio
ORDERING INFORMATION
DESCRIPTION
20-Pin Shrink Small Outline Package (Surface-mount, SSOP)
BLOCK DIAGRAM
MIXER
MIXER
OUT
20
1
PD1
1998 Jan 08
MIXER
GND
GND
OUT
IN
19
18
17
16
2
3
4
5
PD2
GND
LO
GND
OUT
Figure 2. SA631 Block Diagram
PIN CONFIGURATION
1
PD1
PD2
2
3
GND
4
LO OUT
GND
5
GND
6
GND
7
GND
8
GND
9
GND
10
Figure 1. Pin Configuration
TEMPERATURE RANGE
–40 to +85 C
LNA
LNA
V
IN
GND
OUT
CC
15
14
13
12
LNA
6
7
8
9
GND
GND
GND
GND
2
Product specification
SA631
20
MIXER OUT
19
MIXER OUT
18
GND
17
MIXER IN
16
GND
LNA IN
15
GND
14
LNA OUT
13
12
V
CC
GND
11
SR00124
ORDER CODE
DWG #
SA631DK
SOT266-1
GND
11
10
GND
SR01588
853–2045 18847
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